<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>欢迎注册</title>
    <link href="/css/register.css" rel="stylesheet">
</head>
<body>

<div class="form-div">
    <div class="reg-content">
        <h1>欢迎注册</h1>
        <span>已有帐号？</span> <a href="#">登录</a>
    </div>
    <form id="reg-form" action="/registerServlet" method="get">

        <table>

            <tr>
                <td>用户名</td>
                <td class="inputs">
                    <input name="username" type="text" id="username">
                    <br>
                    <span id="username_err" class="err_msg" style="display: none">用户名不太受欢迎</span>
                </td>

            </tr>

            <tr>
                <td>密码</td>
                <td class="inputs">
                    <input name="password" type="password" id="password">
                    <br>
                    <span id="password_err" class="err_msg" style="display: none">密码格式有误</span>
                </td>
            </tr>


            <tr>
                <td>手机号</td>
                <td class="inputs"><input name="tel" type="text" id="tel">
                    <br>
                    <span id="tel_err" class="err_msg" style="display: none">手机号格式有误</span>
                </td>
            </tr>

        </table>

        <div class="buttons">
            <input value="注 册" type="submit" id="reg_btn">
        </div>
        <br class="clear">
    </form>

</div>


<script>
    //用户名验证
    var userinput = document.getElementById("username");
    //失去焦点
    userinput.onblur = checkUsername;

    function checkUsername() {
        if (this.value.length >= 6 && this.value.length <= 12) {
            document.getElementById("username_err").style.display = "none";
            return true;
        } else {
            document.getElementById("username_err").style.display = "";
        }
    }

    //密码验证
    var passwordInput = document.getElementById("password");
    //失去焦点
    passwordInput.onblur = checkPwd;

    function checkPwd() {
        if (this.value.length >= 6 && this.value.length <= 12) {
            document.getElementById("password_err").style.display = "none";
            return true;
        } else {
            document.getElementById("password_err").style.display = "";
        }
    }

    //手机号验证
    var telinput = document.getElementById("tel");
    //失去焦点
    telinput.onblur = checkTel;

    function checkTel() {
        if (this.value.length >= 6 && this.value.length <= 12) {
            document.getElementById("tel_err").style.display = "none";
            return true;
        } else {
            document.getElementById("tel_err").style.display = "";
        }
    }

    var formName = document.getElementsByTagName("form");
    formName.onsubmit = function (){
        if (checkUsername() & checkPwd() & checkTel()){
            return true;
        }else {
            return false;
        }
    }


</script>
</body>
</html>